398 lines
7.5 KiB
Perl
Executable File
398 lines
7.5 KiB
Perl
Executable File
#!/usr/bin/perl
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#
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# Small assembler for the Simple Processor Core
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#
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my $nr_instr_bytes = 4;
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my $nr_opcode_bits = 6;
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my $nr_reg_bits = 5;
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my $startaddr = -1;
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# mnemonnic to opcode conversion
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my %opcodes = (
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'shl' => 0x00,
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'shr' => 0x01,
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'sto' => 0x02,
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'loa' => 0x03,
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'add' => 0x04,
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'sub' => 0x05,
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'addc' => 0x06,
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'subc' => 0x07,
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'or' => 0x08,
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'and' => 0x09,
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'xor' => 0x0A,
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'not' => 0x0B,
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'jpz' => 0x0C,
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'jpc' => 0x0D,
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'jmp' => 0x0E,
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'lui' => 0x0F,
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'jmc' => 0x10,
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'ret' => 0x11,
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'hlt' => 0x3F
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);
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#---------------------------------------------------------------------------
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# main program
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#---------------------------------------------------------------------------
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my $filename = $ARGV[0];
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my %labels;
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# check if file exists
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if ( !-e $filename ) {
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die("file does not exist\n");
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}
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open my $src, "<" . $filename;
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my $addr = $startaddr;
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my $lines = 0;
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my @instructions;
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my $valid;
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while ( my $line = <$src> ) {
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$line =~ /^(\S+)\s(.*)$/;
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my $INSTR = $1;
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my $REST = $2;
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$addr++;
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$lines++;
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my $opc = $opcodes{"$INSTR"};
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my $label = "";
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$opc = $opc << 26;
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$valid = 1;
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if ( $INSTR eq "shl" ) {
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if ( $REST =~ /^[\s\$]+(.*),[\s\$]+(.*),[\s\$]+(.*)$/ ) {
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my $dst = $1;
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my $op1 = $2;
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my $op2 = $3;
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$dst =~ s/\s//g;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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$op1 =~ s/\s//g;
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$op1 = $op1 << 16;
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$opc = $opc | $op1;
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$op2 =~ s/\s//g;
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$op2 = $op2 << 11;
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$opc = $opc | $op2;
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}
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else {
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die("ASM: wrong number of parameters for shl in line $lines\n");
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}
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}
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elsif ( $INSTR eq "shr" ) {
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if ( $REST =~ /^[\s\$]+(.*),[\s\$]+(.*),[\s\$]+(.*)$/ ) {
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my $dst = $1;
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my $op1 = $2;
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my $op2 = $3;
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$dst =~ s/\s//g;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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$op1 =~ s/\s//g;
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$op1 = $op1 << 16;
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$opc = $opc | $op1;
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$op2 =~ s/\s//g;
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$op2 = $op2 << 11;
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$opc = $opc | $op2;
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}
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else {
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die("ASM: wrong number of parameters for shr in line $lines\n");
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}
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}
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elsif ( $INSTR eq "sto" ) {
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if ( $REST =~ /^\$(.*),(.*)$/ ) {
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my $dst = $1;
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$dst =~ s/\s//g;
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$dst = $dst << 16;
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$opc = $opc | $dst;
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my $imm = $2;
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$imm =~ s/\s//g;
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$opc = $opc | $imm;
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}
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else {
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die("ASM: wrong number of parameters for sto in line $lines\n")
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;
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}
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}
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elsif ( $INSTR eq "loa" ) {
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if ( $REST =~ /^\$(.*),(.*)$/ ) {
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my $dst = $1;
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$dst =~ s/\s//g;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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my $imm = $2;
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$imm =~ s/\s//g;
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$opc = $opc | $imm;
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}
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else {
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die("ASM: wrong number of parameters for sto in line $lines\n")
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;
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}
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}
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elsif ( $INSTR eq "add" ) {
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if ( $REST =~ /^[\s\$]+(.*),[\s\$]+(.*),[\s\$]+(.*)$/ ) {
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my $dst = $1;
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my $op1 = $2;
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my $op2 = $3;
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$dst =~ s/\s//g;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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$op1 =~ s/\s//g;
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$op1 = $op1 << 16;
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$opc = $opc | $op1;
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$op2 =~ s/\s//g;
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$op2 = $op2 << 11;
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$opc = $opc | $op2;
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}
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else {
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die("ASM: wrong number of parameters for add in line $lines\n");
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}
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}
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elsif ( $INSTR eq "sub" ) {
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if ( $REST =~ /^[\s\$]+(.*),[\s\$]+(.*),[\s\$]+(.*)$/ ) {
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my $dst = $1;
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my $op1 = $2;
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my $op2 = $3;
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$dst =~ s/\s//g;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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$op1 =~ s/\s//g;
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$op1 = $op1 << 16;
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$opc = $opc | $op1;
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$op2 =~ s/\s//g;
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$op2 = $op2 << 11;
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$opc = $opc | $op2;
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}
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else {
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die("ASM: wrong number of parameters for sub in line $lines\n");
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}
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}
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elsif ( $INSTR eq "addc" ) {
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if ( $REST =~ /^[\s\$]+(.*),[\s\$]+(.*),[\s\$]+(.*)$/ ) {
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my $dst = $1;
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my $op1 = $2;
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my $op2 = $3;
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$dst =~ s/\s//g;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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$op1 =~ s/\s//g;
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$op1 = $op1 << 16;
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$opc = $opc | $op1;
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$op2 =~ s/\s//g;
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$op2 = $op2 << 11;
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$opc = $opc | $op2;
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}
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else {
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die("ASM: wrong number of parameters for addc in line $lines\n");
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}
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}
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elsif ( $INSTR eq "subc" ) {
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if ( $REST =~ /^[\s\$]+(.*),[\s\$]+(.*),[\s\$]+(.*)$/ ) {
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my $dst = $1;
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my $op1 = $2;
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my $op2 = $3;
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$dst =~ s/\s//g;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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$op1 =~ s/\s//g;
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$op1 = $op1 << 16;
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$opc = $opc | $op1;
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$op2 =~ s/\s//g;
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$op2 = $op2 << 11;
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$opc = $opc | $op2;
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}
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else {
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die("ASM: wrong number of parameters for subc in line $lines\n");
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}
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}
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elsif ( $INSTR eq "or" ) {
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if ( $REST =~ /^[\s\$]+(.*),[\s\$]+(.*),[\s\$]+(.*)$/ ) {
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my $dst = $1;
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my $op1 = $2;
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my $op2 = $3;
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$dst =~ s/\s//g;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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$op1 =~ s/\s//g;
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$op1 = $op1 << 16;
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$opc = $opc | $op1;
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$op2 =~ s/\s//g;
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$op2 = $op2 << 11;
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$opc = $opc | $op2;
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}
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else {
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die("ASM: wrong number of parameters for or in line $lines\n");
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}
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}
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elsif ( $INSTR eq "and" ) {
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if ( $REST =~ /^[\s\$]+(.*),[\s\$]+(.*),[\s\$]+(.*)$/ ) {
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my $dst = $1;
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my $op1 = $2;
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my $op2 = $3;
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$dst =~ s/\s//g;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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$op1 =~ s/\s//g;
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$op1 = $op1 << 16;
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$opc = $opc | $op1;
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$op2 =~ s/\s//g;
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$op2 = $op2 << 11;
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$opc = $opc | $op2;
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}
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else {
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die("ASM: wrong number of parameters for and in line $lines\n");
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}
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}
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elsif ( $INSTR eq "xor" ) {
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if ( $REST =~ /^[\s\$]+(.*),[\s\$]+(.*),[\s\$]+(.*)$/ ) {
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my $dst = $1;
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my $op1 = $2;
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my $op2 = $3;
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$dst =~ s/\s//g;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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$op1 =~ s/\s//g;
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$op1 = $op1 << 16;
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$opc = $opc | $op1;
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$op2 =~ s/\s//g;
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$op2 = $op2 << 11;
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$opc = $opc | $op2;
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}
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else {
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die("ASM: wrong number of parameters for xor in line $lines\n");
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}
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}
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elsif ( $INSTR eq "not" ) {
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if ( $REST =~ /^[\s\$]+(.*)$/ ) {
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my $dst = $1;
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$dst =~ s/\s//g;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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}
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else {
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die("ASM: wrong number of parameters for add in line $lines\n");
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}
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}
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elsif ( $INSTR eq "jpz" ) {
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$label = $REST;
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}
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elsif ( $INSTR eq "jpc" ) {
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$label = $REST;
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}
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elsif ( $INSTR eq "jmc" ) {
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$label = $REST;
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my $dst = 31;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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}
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elsif ( $INSTR eq "jmp" ) {
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$label = $REST;
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}
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elsif ( $INSTR eq "hlt" ) {
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}
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elsif ( $INSTR eq "lui" ) {
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if ( $REST =~ /^\$(.*),(.*)$/ ) {
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my $dst = $1;
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$dst =~ s/\s//g;
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$dst = $dst << 21;
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$opc = $opc | $dst;
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my $imm = $2;
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$imm =~ s/\s//g;
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$opc = $opc | $imm;
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}
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else {
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die("ASM: wrong number of parameters for lui in line $lines\n")
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;
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}
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}
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elsif ( $INSTR eq "ret" ) {
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my $op1=31;
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$op1 = $op1 << 16;
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$opc = $opc | $op1;
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}
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elsif ( $INSTR =~ /^(.*):$/ ) {
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$labels{$1} = $addr;
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$addr--;
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$valid = 0;
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}
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else {
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$addr--;
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$valid = 0;
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}
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if ( $valid == 1 ) {
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$line =~ s/\n//;
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my $instruction = {};
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$instruction->{addr} = $addr;
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$instruction->{opc} = $opc;
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$instruction->{comment} = $line;
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$instruction->{label} = $label;
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if ($line =~/jmc/) {
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print "-" .$instruction->{label}."-\n";
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}
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push( @instructions, $instruction );
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}
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}
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close $src;
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# correct labels
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for my $i (@instructions) {
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if ( $i->{label} =~ /\S+/ ) {
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for my $l ( keys %labels ) {
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if ( $i->{label} eq $l ) {
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$i->{opc} = $i->{opc} | $labels{$l};
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}
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}
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}
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}
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for my $i (@instructions) {
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if ($ARGV[1] eq "-vhdl") {
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printf("%4s \t => B\"%.32b\", --%s\n ",$i->{addr}, $i->{opc}, $i->{comment});
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}
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elsif($ARGV[1] eq "-raw") {
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printf("%.32b\n",$i->{opc});
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}else {
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printf( "%4s %.32b #%s\n", $i->{addr}, $i->{opc}, $i->{comment} );
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}
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}
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